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I think, Downpipes are pretty much the same.
They all have a inlet 4' diameter, what your looking for it fitment, the better the fitment the better it will be as there should be a full seal to prevent any leak. Also one that has less bends is more advantages for more free flowing.
As for a no CEL. I highly recommend Fabspeed as they have had great feedback from USERS. (Word of mouth is extremely truthful and useful).
Other then that, it will come down the material they use (Stainless 316 is better than 304). and how good the weld is.
Other then that, downpipes are FAIRLY similar (Short pipe lol)
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